Packing for pumps



H W M s D K.

PACKING FOR PUHPS Filed July 17, 1939 l z/ /0 272 ...Z m

m mi m Patented Mar. 25, 1941 UNITED stares,

PATENT OFFICE manine Fon PUMPS Application July 17, 1939, Serial No. 284,839

4 Claims.

This invention relates to improvements in packing for pumps.

The main objects of this invention are:

First, to provide a high pressure pump having an effective packing which may be quickly assembled and disassembled thereby facilitating the keeping of the pump in a sanitary condition.

Second, to provide a pump structure which is well adapted for use in dairies, and in the handling of food products which is readily disassembled for cleaning purposes, manipulation of a single threaded member being all that is required to clamp or release the packing gland.

Third, to provide a structure having these advantages which is very simple and economical in its parts. I

Objects relating to details and economies of the invention will appear from the description to follow, The invention is dened and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a fragmentary vertical longitudinal section of a structure embodying the features of my invention on a line corresponding to line I-l of Fig, 2, the piston being shown in iull lines.

Fig. 2 is a transverse section on line 2--2 of Fig. 1.

Fig.. 3 is a perspective View of the packing gland thrust member.

My improvements are especially designed by me for use in pumping milk and cream and other food products particularly Where considerable pressure is desired-for example, in homogenizers. These pumps are usually of the multicylinder type but I have shown only a single cylinder and its coacting piston. I have not illustrated the means for actuating the piston.

In the accompanying drawing which is considerably conventionalized, I represents the bed or machine and 2 a cylinder block having a cylinder bore 3 therein. This cylinder bore is stepped to provide a packing recess 4 which surrounds the piston 5. The piston 5, so far as its working is concerned, has a uniform diameter from end to end, The cylinder block is provided with an upstanding abutment 6 disposed in spaced relation to the cylinder portion proper of the cylin` der block and provided with an opening 'l in alignment with the packing recess 4.

The packing recess 4 is provided with a packing ring 8 conformed to receive the packing 9 which is of angle cross section, one arm Il) being arsection corresponding to the member I5.

ranged in the inwardly facing recess II of the packing ring, the other arm I2 of the packing being arranged to abut the end of the packing rmg.

The packing gland I3 is of tubular form having a central bore I4 to receive the piston and it is of such dimensions as to' t or extend into the packing recess as shown in Fig. 1. It is retained and urged into this recess by the thrust member l5 having a `stem portion I6 of non-cir- 0 cular cross section tting into the opening I in the abutment which is preferably of a shape or The member I5 is provided with a flange-like portion Il at its inner end which serves to constitute the 15 body of the member, the attening of the sides I8 in this embodiment forming slots I9 in the sides of the stem.

The thrust member has a bore 2l) through which the piston may be introduced to or removed from the cylinder. The thrust member is provided with outwardly facing inclined cammed thrust surfaces 2l Yat each side of its flattened stem.

The adjusting member 22 is provided with spaced tapered or wedge-shaped cam members 23 coacting with the cammed surfaces 2I of the thrust member so that when the adjusting member is adjusted vertically, the thrust member is advanced or allowed to retract to clamp or release the packing gland. This member 22 is provided with a vertical slot 24 adapted to receive the stem portion of the thrust member. The adjusting member is provided with an arm 2S which overhangs the abutment E, the arm having an opening 21 therein receiving the adjusting screw 28 which is threaded into a suitable tapped hole 29 in the abutment, see Fig. 1.

With this arrangement of parts, the adjusting member may be quickly adjusted to release the packing gland and permit its removal, also the removal of the packing and packing ring for the purpose of cleaning and sterilizing. The piston is of course removed prior to the removal of the packing gland and the packing, and the packing gland and its packing are replaced before the piston is reinserted. The manipulation of a single screw is all that is required to release or tighten the packing gland. 50

I have illustrated and described'my improvements in a highly efficient embodiment thereof. I have not attempted to illustrate certain modifications and adaptations which I contemplate as it is believed that this disclosure will enable those skilled in the art to embody or adapt my improvements as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a pump, the combination of a cylinder blo-ck having a cylinder bore stepped to provide an outwardly facing packing recess, said block having an abutment in opposed spaced relation to said recess and having a non-circular opening therein aligned with said cylinder bore and adapted to receive a thrust member, a piston coacting with said cylinder and disposed through said opening in said abutment, a packing for said piston arranged in said packing recess, a coacting tubular gland member adapted to enter said recess, a thrust member slidably arranged in said opening in said abutment and conformed thereto in cross section so as to be restrained from rotation therein, said thrust member having inclined outwardly facing thrust surfaces, said piston being insertable into said cylinder through said thrust member and said gland, a wedge-shaped gland adjusting member embracing said thrust member to coact with said thrust surfaces thereo-f, said adjusting member being in supporting engagement with the inner side of said abutment and having an arm overhanging the same, and an adjusting screw arranged through said arm and having threaded engagement with said abutment.

2. In a pump, the combination of a cylinder having an outwardly facing packing recess, an abutment in opposed spaced relation to said recess and having a non-circular opening therein aligned with said cylinder and adapted to vreceive a thrust member, a removable piston Ycoacting with said cylinder, a packing for said piston arranged in said packing recess, a coacting tubular gland member adapted to enter said recess, a thrust member slidably 'arranged in said opening in said abutment and conformed thereto in cross section so as to be restrained from rotation therein, said thrust member having outwardly facing thrust surfaces, said piston being insertable into said cylinder through said thrust member and said gland, a bifurcated wedge-shaped gland adjusting member embracing said thrust member to coact with said thrust surfaces thereof, said adjusting member being in supporting engagement with the inner side of said abutment, and a threaded adjusting means for said adjusting member.

3. In a pump, the combination of a cylinder having an outwardly facing packing recess, an abutment in opposed spaced relation to said recess, a piston coacting with said cylinder, a packing for said piston arranged in said packing recess| a gland member for said packing, a thrust vmember mounted on said abutment in thrust engagement with said gland member and having an outwardly facing thrust surface, said piston being insertable into said cylinder through said thrust member and said gland, a tapered gland adjusting member coacting with said thrust surface of said thrust member, said adjusting member being in supporting engagement with said abutment and having an arm overhanging the same, and an adjusting screw arranged through said arm and having threaded engagement with said abutment.

4. In a pump, the combination of a cylinder having an outwardly facing packing' recess, an abutment in `opposed spaced relation to said recess, a piston coacting with said cylinder, a packing for said piston arranged in said packing recess, a gland member for said packing, a thrust member mounted on said abutment in thrust engagement with said gland member and having an 

